Abstract
We propose a new method to calculate stellar weak-interaction rates. It is based on the thermofield dynamics formalism and allows calculation of the weak-interaction response of nuclei at finite temperatures. The thermal evolution of the distributions is presented for the sample nuclei and . For Ge we also calculate the strength distribution of first-forbidden transitions. We show that thermal effects shift the centroid to lower excitation energies and make possible negative- and low-energy transitions. In our model we demonstrate that the unblocking effect for transitions in neutron-rich nuclei is sensitive to increasing temperature. The results are used to calculate electron capture rates and are compared to those obtained from the shell model.
2 More- Received 2 November 2009
DOI:https://doi.org/10.1103/PhysRevC.81.015804
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